Better g++ theme & localization

The g++ theme now check the locale to use unicode quotation mark if necessary.
Start of error paragraphs are highlighted in green.
Colout now use python3 for a simpler unicode support.

colout/colout.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #encoding: utf-8
 
 # Color Up Arbitrary Command Ouput

colout/colout_g++.py

@@ -1,16 +1,28 @@
+#encoding: utf-8
 
 def theme():
-    import gettext
     import os
+    import gettext
+    import locale
 
     # get g++ version
     gv = os.popen("g++ -dumpversion").read().strip()
 
     # get the current translations of gcc
     t = gettext.translation("gcc-"+gv)
-    _ = t.ugettext
+    _ = t.gettext
     # _("msg") will return the given message, translated
 
+    # if the locale is unicode
+    enc = locale.getpreferredencoding()
+    if "UTF" in enc:
+        # gcc will use unicode quotes
+        qo = "‘"
+        qc = "’"
+    else:
+        # rather than ascii ones
+        qo = "'"
+        qc = "'"
 
     return [
         [ _("error: "), "red", "bold" ],
@@ -18,11 +30,20 @@ def theme():
         [ _("note: "), "blue", "bold" ],
         # [-Wflag]
         [ "\[-W.*\]", "magenta"],
-        # Filename:line number
+
-        [ "(/.*?)/([^/]+\.)(h|cp*):([0-9]+):*([0-9]*)(.*)",
+        # Highlight message start:
-          "white,white,white,yellow,yellow,none",
+        #   path   file   ext     : line   :  col     …
-          "normal,bold,bold,bold,normal" ],
+        [ "(/.*?)/([^/:]+): (In .*)"+qo,
+          "green",
+          "normal,normal,bold" ],
+
+        # Highlight locations:
+        #   path   file   ext     : line   :  col     …
+        [ "(/.*?)/([^/:]+):([0-9]+):*([0-9]*)(.*)",
+          "none,white,yellow,none,none",
+          "normal,normal,normal,normal" ],
+
         # source code in single quotes
-        [ "'(.*?)'", "Cpp", "monokai" ]
+        [ qo+"(.*?)"+qc, "Cpp", "monokai" ]
     ]